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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dda078ac0857ff5f4c71a10c5b5044de9829fbbf98595810f78ce0f1beaa1e' 
  AND token = 'dm0eRpayZyqDAa0l0tCIy0lc1U0KclrHpcR13DEQWvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}